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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 128 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 56 =
  2. 2.Double 91 =
  3. 3.Half of 94 =
  4. 4.Double 78 =
  5. 5.Double 96 =
  6. 6.Half of 106 =
  7. 7.Double 51 =
  8. 8.Double 33 =
  9. 9.Double 79 =
  10. 10.Double 71 =
  11. 11.Double 63 =
  12. 12.Double 18 =
  13. 13.Half of 168 =
  14. 14.Double 74 =
  15. 15.Double 38 =
  16. 16.Double 26 =
  17. 17.Double 19 =
  18. 18.Half of 148 =
  19. 19.Half of 72 =
  20. 20.Double 61 =
  21. 21.Half of 130 =
  22. 22.Double 37 =
  23. 23.Half of 40 =
  24. 24.Half of 194 =
  25. 25.Double 46 =
  26. 26.Half of 160 =
  27. 27.Double 87 =
  28. 28.Double 32 =
  29. 29.Half of 146 =
  30. 30.Half of 188 =
  31. 31.Half of 132 =
  32. 32.Half of 56 =
  33. 33.Half of 84 =
  34. 34.Double 24 =
  35. 35.Double 89 =
  36. 36.Double 82 =
  37. 37.Half of 114 =
  38. 38.Double 41 =
  39. 39.Half of 48 =
  40. 40.Half of 88 =

Answer key

  1. 112
  2. 182
  3. 47
  4. 156
  5. 192
  6. 53
  7. 102
  8. 66
  9. 158
  10. 142
  11. 126
  12. 36
  13. 84
  14. 148
  15. 76
  16. 52
  17. 38
  18. 74
  19. 36
  20. 122
  21. 65
  22. 74
  23. 20
  24. 97
  25. 92
  26. 80
  27. 174
  28. 64
  29. 73
  30. 94
  31. 66
  32. 28
  33. 42
  34. 48
  35. 178
  36. 164
  37. 57
  38. 82
  39. 24
  40. 44

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